Terminal-exhaust steam-engine.



J. DAVIDSON.

TERMINAL EXHAUST STEAM ENGINE APPLICATION FILED MAY 20, 1911 1,090,030, A Patented Mar. 10, 1914.

5 728615196" 20622507 7/ n jmmz/ ra/Q/W W/ JOHN DAVIDSON, OF PENDLETON, ENGLAND.

TERMINAL-EXHAUST STEAM-ENGINE.

Specification of Letters Patent.

Application filed May 20, 1911.

atcntcd Mar. 10, 1914.

Serial No. 628,369.

1 '0 all whom it may concern:

Be it known that I, JOHN DAVIDSON, a subject of the King of Great Britain, residing at Pendleton, in the county of Lancaster, England, Kingdom of Great Britain, have invented certain new and useful Improvements in Terminal-Exhaust Steam-Engines, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in the cylinders of that class of steam engines which are known as terminal exhaust steam engines and in which the steam always flows in one direction.

The object of my invention is to minimize the cooling effect of the exhaust belt, as owing to the cooling eflfect of the exhaust belt, and owing to the shortness of the stroke in high speed engine's, this belt would inclose a large percentage of the barrel it made in the ordinary manner. I attain this object by the means illustrated in annexed drawing showing longitudinal sections of a cylinder formed with my improved exhaust belt.

Figure 1 showing the cylinder without, and Fig. 2 with a steam acket.

Similar letters refer to similar parts throughout the several views.

. Referring to Fig. 1, for the purpose of my Invention, 1 make the exhaust belt with a narrow neck 0 where it is connected to the cylinder and communicates with the circular row of exhaust ports and with an enlarged exhaust passage 1) around it whereby a very small portion of the cylinder is affected by the cold belt.

When steam jacketing the cylinder, as shown in Fig. 2, the jacket may be carried a conside able distance along the cylinder and yet allow of a small space at 0 so that the jacket may be separated from the exhaust belt by non-conducting material,

I claim:

.In a unillow steam engine, a cylinder having an annular series of central. exhaust ports; an exhaust belt surrounding said cylinder and tapered toward the cylinder to term a narrow neck the interior of which connnunicates and corresponds in width with the exhaust ports producing an enlarged exhaust passage spaced away from the exterior of the cylinder.

In testimony whereof I have aflixed my signature in presence of two witnesses.

JOHN DAVIDSON.

Witnesses FERDINAND B. Bossnano'r, STANLEY E. BRAMALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

